<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>7.2</title>
	<script src="js/vue.js"></script>
	<style>
		.active{ text-decoration: underline;}
		.text-danger {front-weight: bold;}
		</style>
	</head>	
	<body>
	    <div id="app">
		    <div v-bind:class="[activeClass,errorClass]">Hello Vue!</div>
	    </div>
	</body>
	<script>
		var vm = new Vue({
			el: '#app',
			data: {
				activeClass: 'active',
				errorClass: 'text-danger',
			}
		})
	</script>
</html>